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Compressed sensing in synthetic aperture photoacoustic tomography based on a linear array ultrasound transducer

(I)Synthetic aperture configuration with 1/4 data acquisition channel. Limited view reconstruction results (II) and enhanced resolution simulation results (III). The photoacoustic images reconstructed by (a) BP with center aperture (b) BP with synthetic aperture (c) CS with synthetic aperture (d) CS with 1/4 synthetic aperture. Fig. III (e) is the profile along the center line on Figs. III (a)-(d). Note: Back projection (BP), Compressed sensing (CS).

Photoacoustic tomography (PAT) is a noninvasive and non-ionizing hybrid biomedical imaging modality, which has the unique capability of visualizing optical absorption inside the several centimeters deep biological tissue with high acoustic spatial resolution. It is of great value on clinic as a powerful supplement of traditional ultrasound imaging. However, the single linear array transducer based PAT suffers from the limited view challenge and the resolution is still not high enough in current PAT configuration.

In the recent work, a feasible synthetic aperture PAT based on the compressed sensing reconstruction algorithm proposed by Xiangwei Lin, a Ph. D. student in Associate Prof. Mingjian Sun's lab at Harbin Institute of Technology, has overcome these difficulties without any additional data acquisition hardware. This approach combined the ultrasound spatial compounding method to extend the effective aperture size and the compressed sensing technique to reduce the measurement dataset. Both the simulation and experimental results testified the theoretical model and validated that this approach can efficiently improve the image resolution and address the limited view problem while preserving target information with less number of measurements.

This research relies on the synthetic aperture PAT to achieve the multi-view data acquisition to solve the limited view challenge and sparse sampling in the compressed sensing algorithm to recover the target structure of biomedical tissue with reduced measurements. It could provide a potential solution in the clinical transformation to visualize the structure of blood vessel, human breast more clearly and completely with the clinical B-mode ultrasound imaging system. This work is reported in Chinese Optics Letters Volume 15, No. 10, 2017 (Xiangwei Lin, et al., Compressed sensing in synthetic aperture photoacoustic tomography based on a linear-array ultrasound transducer).

“The presented work has greatly improved the resolution of PAT system and its potential for clinical transformation by multi-view sparse data sampling and the compressed sensing reconstruction algorithm”, said Associate Prof. Mingjian Sun.

In the future study, with the optimized sparse sampling, real time 3D synthetic aperture based PAT for whole-body small animal imaging and clinical feasibility for peripheral vessels and human breast imaging will be further investigated.

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图片说明:(I) 基于压缩感知稀疏采样的合成孔径光声断层成像概念模型,这一方法可用于解决血管仿体的探测角度受限问题 (II) 和实现系统的空间分辨率增强(III)。(a)-(d) 分别展示了中心阵列反投影重建、合成孔径反投影重建、合成孔径稀疏重建、1/4合成孔径稀疏重建结果。图(III)(e)为对空间分辨率的定量分析。



该项研究的创新之处在于将压缩感知方法运用到基于空间复合的合成孔径成像技术中,可在临床现有超声成像设备的基础上完成多角度的稀疏数据采集和压缩感知重建,能够完整展现大血管、人体乳腺组织结构,对光声断层成像技术在临床转化方面的应用具有一定的推动作用。相关研究成果发表在Chinese Optics Letters 2017年第10期上(Xiangwei Lin, et al., Compressed sensing in synthetic aperture photoacoustic tomography based on a linear-array ultrasound transducer)。



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